/* 华氏度转摄氏度 */
#include <stdio.h>
#define FREEZING_PT 32.0f
#define SCALE_FACTOR (5.0f / 9.0f)
int main(void)
{
    float fahrenheit, celsius;
    printf("输入华氏度: ");
    scanf("%f", &fahrenheit);
    celsius = (fahrenheit - FREEZING_PT) * SCALE_FACTOR;
    printf("摄氏度: %.2f\n", celsius);
    return 0;
}